FTB won't launch modpack

  • Tech Support section is for getting help with FTB related problems. If there's a repeatable issue that can be labeled as a bug, then please use the issue tracker for the pack or the app at GitHub issue trackers - If there's no repository for a pack that means that the pack is old and/or will not be updated. Bugs for older packs will not be fixed, unless they are critical.
  • The FTB Forum is now read-only, and is here as an archive. To participate in our community discussions, please join our Discord! https://ftb.team/discord
Make sure to add exceptions to your antivirus software, both the game folder and for java.
 
Depends on what AV you use, browse to the AV's website or just use a search engine to find the answer that fits for your setup.